Walk down a street in downtown Martinez, the older tracts of Concord, Saranap in Walnut Creek or Gregory Gardens in Pleasant Hill and look up: the trees are 60 to 80 years old. So are most of the sewer laterals under them. Those laterals were laid in sections of clay pipe with mortar joints, or in cast iron that has been rusting from the inside since the Eisenhower administration. Roots do not break into a good pipe; they find the joint that already weeps and follow the water. By the time you notice, there is usually a root mass the size of a fist somewhere under your front yard.
The six warning signs
- Drains that get slow, speed up after a cleaning, then get slow again. Roots regrow. If the same drain needs a snake every six to twelve months, the cable is trimming the roots, not removing the problem.
- Gurgling from a toilet or tub when another fixture drains. A partial blockage traps air; the gurgle is the air escaping through the nearest trap.
- Multiple fixtures backing up at once, especially the lowest ones (a shower in a ground-floor bathroom, a floor drain, the cleanout in the yard). One slow sink is a branch line; everything slow at once is the main lateral.
- Sewage odor in the yard or a soft, soggy patch that never dries out. Wastewater is leaking out of the pipe at the root intrusion.
- A stripe of unusually green, fast-growing lawn or a shrub that outgrows its neighbors along the path from the house to the street. The plants have found a fertilizer supply.
- Backup after heavy rain. In the wet season, a cracked lateral takes on groundwater and the extra flow pushes a marginal pipe over the edge. Many of the calls we get in January are roots that have been there since summer.
Why these neighborhoods specifically
Three things come together in central Contra Costa County: housing stock from the 1920s through the 1960s, heavy clay soil that swells and shrinks with the seasons and shifts pipe joints, and street trees (liquidambar, sycamore, camphor, redwood, the occasional willow) with aggressive, water-seeking roots. Homes in Lafayette, Orinda and Moraga built on creekside lots see the same thing with native oaks and bay laurels. Newer subdivisions in San Ramon or Hercules with ABS or PVC laterals rarely have this problem, which is why a camera inspection matters most on older homes.
What we do when you call
1. Clear the line
If you are backed up, the first job is getting the house draining. A cable machine with a root-cutting head opens most lines quickly. For heavy root masses or grease-and-root combinations, hydro jetting (high-pressure water) scours the pipe wall clean rather than punching a hole through the middle.
2. Camera the line
Once it is flowing, we run a sewer camera from the cleanout to the city main and show you the video. The camera tells us what kind of pipe you have, where every root intrusion is, whether there are offsets or bellies, and how far it is to the main. A locator on the camera head marks the problem spots on the surface so a repair is dug in the right place, once.
3. Give you the options in writing
- Maintenance cleaning. If the pipe is structurally sound and the roots are at one or two joints, scheduled jetting every year or two can be a reasonable, lower-cost path, particularly if you plan to sell soon.
- Spot repair. One bad joint near the house or the sidewalk gets excavated and replaced with a short section of new pipe and proper transition couplings.
- Trenchless replacement. For a lateral with roots at most joints, pipe bursting pulls a new seamless HDPE pipe through the old one from two small access pits. No roots can get into a pipe with no joints. Driveways, patios and mature landscaping mostly stay put.
- Open-trench replacement. Still the right answer when the old pipe has collapsed or has too many turns for a burst head, or where the depth and soil make it the cheaper option.
Backed up or gurgling?
24/7 drain and sewer service across Contra Costa County. Camera inspection included with every main-line clearing so you know exactly what you are dealing with.
What it costs
A main-line clearing with a camera inspection is the least expensive step and is often all a house needs for another year. A spot repair runs into the low thousands depending on depth and location. A full trenchless replacement of a typical 40–60 foot residential lateral is a larger investment, and a long lateral under a street with a deep main is the top of the range. Sewer work in Martinez, Concord and Walnut Creek requires a permit from the city or the sanitary district, and the inspection fee is part of the quote. Every job gets a written price before we start, and we are happy to put the camera video in your hands so you can get a second opinion.
Preventing the next one
If you keep an older lateral, have it jetted on a schedule rather than waiting for the backup, keep new trees at least ten feet from the sewer path (we can mark it for you), and never plant willows, poplars or fig trees anywhere near it. If you are buying an older home, our sewer camera inspection during the contingency period is the best money you will spend in escrow. In Berkeley, El Cerrito and Richmond the sewer lateral is tested at sale by law; our guide to the sewer lateral compliance certificate explains how.
Common questions
How do I know if tree roots are in my sewer line?
Recurring slow drains, gurgling fixtures, several drains backing up at once, sewage smell or a soggy patch in the yard, and backups after heavy rain are the common signs. A sewer camera inspection confirms it and shows exactly where the roots are.
Can tree roots be removed from a sewer line without digging?
Yes. Cabling with a root-cutting head or hydro jetting clears the roots from inside the pipe. That restores flow, but the roots return through the same joint unless the pipe is repaired or replaced; trenchless pipe bursting replaces the lateral with minimal digging.
Who is responsible for the sewer lateral in Contra Costa County?
The property owner, in almost every city and sanitary district here, is responsible for the lateral from the house to the connection at the public main, including the section under the sidewalk and street. The agency maintains the main itself.
Nick, owner of Apex PlumbingLicensed C-36 plumbing contractor (#1115087) based in Martinez, serving all of Contra Costa County since 2024 with 200+ five-star Google reviews. Questions about this article? Call (925) 226-8543, any hour.
